Division of Chemical Process Engineering and Frontier Chemistry Center (FCC), Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8 Kita-ku, Sapporo, Hokkaido 060-8628 (Japan), Fax: (+81) 11-706-6561.
Chemistry. 2013 Nov 25;19(48):16214-20. doi: 10.1002/chem.201303394. Epub 2013 Nov 7.
We report the luminescent color tuning of a new complex, 2-benzothiophenyl(4-methoxyphenyl isocyanide)gold(I) (1), by using a new "polymorph doping" approach. The slow crystallization of the complex 1 afforded three different pure polymorphic crystals with blue, green, and orange emission under UV-light irradiation. The crystal structures of pure polymorphs of 1 were investigated in detail by means of single-crystal X-ray analyses. Theoretical calculations based on the single-crystal structures provided qualitative explanation of the difference in the excited energy-levels of the three polymorphs of 1. In sharp contrast, the rapid precipitation of 1, with the optimized conditions reproducibly afforded homogeneous powder materials showing solid-state white-emission with Commission Internationale de l'Éclairage (CIE) 1931 chromaticity coordinates of (0.33, 0.35), which is similar to pure white. New "polymorphic doping" has been revealed to be critical to this white emission through spectroscopic and X-ray diffraction analyses. The coexistence of the multiple polymorphs of 1 within the homogeneous powder materials and the ideal mixing of multiple luminescent colors gave its white emission accompanied with energy transfer from the predominant green-emitting polymorph to the minor orange-emitting polymorph.
我们报告了一种新配合物，2-苯并噻吩（4-甲氧基苯基异氰化物）金（I）（1）的发光颜色调谐，采用了一种新的“多晶掺杂”方法。该配合物 1 的缓慢结晶得到了三种不同的纯多晶型体，在紫外光照射下分别发出蓝色、绿色和橙色光。通过单晶 X 射线分析详细研究了纯多晶型体 1 的晶体结构。基于单晶结构的理论计算定性解释了 1 的三种多晶型体激发能级的差异。相比之下，1 的快速沉淀，在优化条件下可重复性地得到具有均匀粉末材料的固态白色发射，色坐标为（0.33，0.35），与纯白光相似。通过光谱和 X 射线衍射分析表明，新的“多晶掺杂”对这种白色发射至关重要。多晶型体 1 在均匀粉末材料中的共存以及多种发光颜色的理想混合使其发出白色发射，同时伴随着从主要的绿色发射多晶型体到次要的橙色发射多晶型体的能量转移。
